<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=504287414635989&amp;ev=PageView&amp;noscript=1">

SEARCH

Where To Try Contact Us

Built on Biomechanics. Proven by Research.

Prolonged sitting is one of the biggest contributors to spinal compression, disc stress, and posture-related pain. The adjustable two-part back system was designed to solve that problem — not with a one-size-fits-all lumbar pad, but with precision postural control that adapts to every body type.

Backed by independent university research and validated digital human modeling, this system supports the spine where it matters most, at the pelvis and thoracic segments, helping maintain a neutral posture, reduce disc pressure, and prevent long-term strain.

Why Traditional Backrests Fall Short

Most office chairs use a single, fixed lumbar curve. While it may feel supportive at first, studies show that these systems often fail to match individual spinal shape, leading to:

  • Posterior pelvic tilt and slouched sitting
  • Increased lumbar flexion and disc loading
  • Higher risk of chronic back discomfort
  • Posterior pelvic tilt and slouched sitting

A biomechanical approach was needed, one that considers how real spines move and load under pressure.

The Two-Part Solution:

Independent Pelvis AND Thoracic Support

The Precision Posture System separates the lower and upper back supports, allowing each to move and adjust independently:

  • Pelvis support locks the foundation of the spine in a neutral position, preventing posterior tilt and maintaining healthy disc spacing.
  • Upper back support follows natural thoracic curves, promoting upright posture without restricting shoulder movement.

This Precision Posture System keeps your spine aligned in its mid-range — where disc pressure is minimized, and muscle activity is balanced.

image-Dec-30-2025-11-49-54-1479-AM

Keeping the Spine in Its Safe Zone

The lumbar spine’s two most mobile joints, L4–L5 and L5–S1, are where most flexion and loading occur when sitting. Both Pope et al. (1986) and White & Panjabi (1990) quantified segmental lumbar ranges of motion in healthy adults.

Their data, which have become the accepted clinical and research reference values, report approximately:

Segment Flexion ROM
L4–L5 12–15°
L5–S1 8–12°

Source: Data adapted from White, A.A. & Panjabi, M.M. (1990). Clinical Biomechanics of the Spine (2nd ed.). Lippincott Williams & Wilkins; and Pope, M.H. et al. (1986). Electromyographic studies of the lumbar spine. Spine, 11(5), 489–493.

image-Dec-30-2025-11-55-05-7317-AM
image-min (2)

Most of the movement during sitting happens at L4–L5. When a chair lacks proper pelvis support, users often collapse into 14–15° of flexion, placing them near the end range of that motion, where disc pressure and shear forces are highest.

The Precision Posture System is designed to hold users in a mid-range posture.

  • This is the biomechanical sweet spot
  • This may reduce anterior shear
  • This may lower compressive spinal loads

This mid-range alignment was confirmed through both human modeling and independent lab research.

Company

Info

Anthros Chair on Facebook Anthros Chair on Instagram Anthros Chair on LinkedIn Anthros Chair on Youtube

Join our email list

Sign up to get special offers, the latest videos, news, + more.